A separability condition based on the product variance of a pair of Einstein-Podolsky-Rosen (EPR) type operators is obtained for continuous-variable systems by using Heisenberg uncertainty relation and Cauchy-Schwarz inequality.
基于一对Einstein-Podolsky-Rosen(EPR)型算符的方差求积,利用柯西-施瓦兹不等式和海森伯不确定关系得到了多模连续变量系统的可分性条件,此条件不仅可以用来探测非高斯态,还可以探测相干态的情况。